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      06-04-2009, 03:48 AM   #114
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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Originally Posted by tom @ eas View Post
Registration only takes into account a stored reading of battery capacity at 80%, odometer reading and refreshed stored temperature statistics. This will not aid in charging.
Thanks for your reply. Can you clarify - what does the stored reading of battery capacity at 80% mean exactly?

Originally Posted by tom @ eas View Post
We're using the 21lb Braille in our M3 and 17lb in our 1-series project, the 1-series is a daily driver with no problems, the M3 needs to be started up about once a week.

Smaller batteries simply have less reserve capacity at a cost of shaving weight - drive often.
Maybe you haven't read the whole thread. Do you have comfort access, Bluetooth? It was suggested (perhaps speculated) prior in this thread the comfort access may create a higher drain on the batter during the time the car is not used. My 21 lb B3121 simply can not handle two days in a row without driving, let alone simply being started once a week. Sure the car will start but the clock and trip odometer get reset and CA starts to not allow the one touch open. Something must be different, either our cars or our batteries.